Did you hear the rumors about Christie Brinkley dating John Mellencamp? Of course you did, because we told you about it.  Well, apparently Christie’s ex Billy Joel has, too.

A source who caught Billy’s concert at Madison Square Garden in New York Saturday night claims Billy even made a crack about the new couple.

A witness tells Us Weekly that after performing “The Longest Time,” a tune he reportedly wrote about Brinkley, Billy added, “And now she's dating John Mellencamp."

Brinkley and Mellencamp were first spotted together earlier this month in New York City on what sources claim was their first date. What we do know is that Joel and Brinkley, who share their 28-year-old daughterAlexa Ray, were married from 1985-1994.

And by all accounts, they remain good friends. So did he snark...or make a statement of fact? I guess we can all make our own guess.

And here I always thought 'Uptown Girl' was about Brinkley.

Here's a live version of 'The Longest Time' from 1984 when Billy reminded me of Michael Keaton.

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